Numerical study on influence of the bogie bottom plate on aerodynamic drag of high speed train running at 400 km/h
Numerical simulations was made to study the influence of the bogie covering structure on the aerodynamic resistance of the high-speed train running at 400 km/h in the open air.The drag and flow structures of high speed train with different covering forms were analyzed,and the installation heights and gap spacing of covering structure were selected for comparison.The results show that both the fully enclosed and separated type covering structures have great drag reduction effects on the whole train,and the best drag reduction rate is up to 9.76%.The bogie area of the head car contributes most to the drag reduction,while the resistance of the middle car increases.And the more covering area of the front car,the larger resistance increase of the middle car.Meanwhile,the drag reduction variation of the covering structure with installation heights is non-monotonic.Proper downward movement is beneficial to the overall drag reduction,mainly because it reduces the bogie resistance of the intermediate car.Besides,when the gap spacing is maintained within a certain range,the drag reduction of the whole train does not change much.However,when the gap continues to increase,the drag reduction effect will become worse,because the excessive gap will significantly enhance the impact of air flow on the bogie and cabin,resulting in the decrease of aerodynamic drag of the train.
万方数据
维普
